27
9.4 Gas flow pressure inspection
(natural gas only)
– Shut stopcock in main gas supply to boiler unit. Re-
lease sealing screw in measure device joint for input
pressure (see Fig. 6, pos. 2) and connect tube
manometer.
– Open stopcock in main gas supply to boiler unit and
ignite boiler.
– Normal flow pressure 18 to 25 mbar.
The gas flow pressure must be 18 mbar minimum.
If the gas flow pressure is below 18 mbar, find cause and
carry out corrective action. If no cause can be found,
contact your gas supply company.
Shutting off the boiler unit. The boiler unit may no
longer be put into operation.
– Shut off boiler unit after completion of the adjustment
work.
– Shut stopcock in main gas supply to boiler unit.
– Remove U-tube manometer and secure sealing screw
in measure device joint.
9.5 Functional inspection
– Open stopcock and ignite the boiler unit
(see Chapter 10).
– Check entire system for water or gas leakages.
– Check waste gas flue.
– Check regularity of flames of main burner.
– Demonstrate to customer how to use the system.
9.6 Conversion to alternative gas type
The adjustment of the boiler unit to an alternative type of
gas may only be carried out by a qualified specialist.
Adjustment procedure:
– Determine diameter for main nozzle and ignition
nozzle* (see Chapter 6, technical specifications).
– Shut stopcock to boiler unit.
– Switch off power supply
– Open boiler unit door
– Unscrew burner nozzle and ignition nozzle * and
subsequently insert and secure the new nozzles that
comply with the new gas type.
– Attach label indicating the new type of gas to the gas
distributor.
– Start up the boiler unit in compliance with the operating
manual and adjust the capacity in accordance with the
new type of gas (see Gas settings table).
* The Ø 0,5 mm ignition nozzle for H and L
natural gas must be replaced by the Ø 0,3 mm
ignition nozzle for liquified gas in the event of
conversion to liquified gas.
The nozzle pressure listed in the gas settings
tables must be adhered to.
Gas setting table
(1 mbar = 10 mmWS ), nozzle pressure at nominal capacity in mbar for 15°C, 1013 mbar dry
GA 110/9 E GA 110/15E GA 110/19 E GA 110/23 E GA 110/27 E GA 110/31 E GA 110/35 E GA 110/41 E GA 110/46 E GA 110/51 E
Natural gas E
Wobbe-Index Wo
12,7 - 15,2 kW/m
3
Natural gas LL
Wobbe-Index Wo
10,9 - 12,4 kW/m
3
Liquified gas
Type of gas
Nozzle pressure in mbar
15
14,2
12,6
13,8
15
14,8
15
15
14,7
15
10,3
9,8
9,5
9,5
10,3
10,1
10,3
10,3
10,1
10,3
29
GA 110/9 E GA 110/15E GA 110/19 E GA 110/23 E GA 110/27 E GA 110/31 E GA 110/35 E GA 110/41 E GA 110/46 E GA 110/51 E
Natural gas E
Calrific value HuB
10,0 kW/m
3
Natural gas LL
Calrific value HuB
8,6 kW/m
3
Type of gas
Gas flow in ltr/min
17
27
37
43
51
60
69
78
59
70
80
90
18
32
42
56
101
108
87
93